The former Germany skipper felt his side deserved better after holding its own at Camp Nou for the majority of an absorbing contest.
Philipp Lahm lamented Bayern Munich's late collapse against Barcelona which means it is facing a near-impossible task to make it through to the Champions League final.
Bayern held its own at Camp Nou for 77 minutes before Lionel Messi took center stage, scoring two and creating a third in injury time for Neymar as Barca won the first leg of their semifinal 3-0.
Lahm told ZDF: "The result is not a fair reflection.